Michael mahony



(No Model.)

' M. MAHONY.

BOILER.

Patented Aug. 9, 1887.

Wiln'esae-sv I fizvenlon' y 1mm N. PETERS. Phuln-Lithizgnphnr, wmmmmgi'ushell B,a continuous body extending all around with my invention.

, UNIT D STATES PATENT OFFICE.

MICHAEL MAHONY, or TROY, NEW YORK.

BOILER.

SPECIFICATIONfor ming part of Letters Patent No. 367,988, dated August9, 1887.

I Application filed May 26, 1887. Serial No. 239,412. (No model.)

.T 0 all whom, it may concern.-

Be it-known that I, 1VIIGHAEL MAHoNY, a citizen of the United States,residing at Troy, in the county of Bensselaer and State'of New York,have invented certain new and useful Improvements in \Vater-Boilers, ofwhichthe following is a speeification,reference being had therein to theaceompanyingdrawings.

This invention has relation to water-boilers, more particularly tothatclass that are made of cast-iron, for heating dwellings and otherbuildings; and the objects of my invention are to provide a water-boilerfor such purposes in which the water will circulate rapidly,and will beconstructed of as few pieces as possible to prevent the danger of leaksat the joints, and by reducing the time necessary for its constructionwill diminish its expense. I accomplish these objects by theconstruction illustrated in the accompanying drawings, in which Figure 1is a perspective View, partly in section, of a boiler constructed inaccordance.

Fig. 2 is a vertical section of the same on line at x of Fig. 3. Fig. 3is a horizontal section on line :1; y of Fig. 2.

In said drawings, A represents the outer shell,and B the innershell,ofthe boiler. These parts are supported by the base-plateO,forming the top of the ash-pit D, the walls of which support the grateD. Projecting from the surface of the base-plate there is a verticalflange, c, that surrounds the lower end of the shell of the boiler andmaintains it in proper position. taiued about an inch and a half or twoinches apart to form awater leg or chamber,surrounding the lower end ofthe inner shell and the fire-chamber B of the boiler. Above saidfire-chamber the inner shell is provided with a series of radial hollowribs, 1), having a closed bottom extending vertically over thefire-chamber. These ribs form,with the inner the central vertical flue,B retained between the closed inner ends, if, of the ribs; and withinsaid flue is placed the magazine H, of suitable diameter, so that itssurface is within The two shells of the boiler are re an inch of theinner end of the ribs. Between each rib a large vertical flue, b, isproduced for the ascent of the products of combustion against the sidesof the ribs and the inner surface of the shell B. The flues I) lead theproducts of combustion into the contracted passage between a collar, b,extending upward from the inner ends, b, of the ribs and maga-' zine H,and thence under a hood, G, extending over the top of the magazine, andfrom said hood they are conducted in any direction through a flue, 9,attached to said hood. The magazine can be suspended either from saidhood or by means of lateral projections resting upon the top of thecollar 1)". By having the inner shell of the'boiler and all its radialribs formed in one piece or body the number of joints in theconstruction of the boiler is reduced to a minimum, there being onlytwo. The lower joint is rendered steam-tight by forming an annular rib,to, around the bottom of the shell A, on the inner side thereof, and

an annular rib, If", on the outside of the inner shell. The latter ribis cylindrically turned, so as to substantially fit within the rib a,and has a circular groove, I)", cut in it to reeeivea suitable cementwell packed therein to form a water-tight joint at that point. The edgeof the outer shell, at the top thereof, is also cylindrically turned tosubstantially fit around the collar b", and has cut therein a circulargroove, 6, to also receive some pacliingcement and form a water-tightjoint at that point. The steam or hot water produced in the boiler iscarried off by means of two pipes, f, issuing vertically from the top ofthe boiler, close to the rear of the magazine-hood. They are united, ifdesired,at their upper ends by means of a horizontal pipe, f carrying atthe middle of its length a vertical pipe, f". In the side of the boileropposite its fire-chamber is placed a door, A through which the fire maybe kindled and observed. I

To regulate the draft,the ash-pit is provided with a door, D havinghinges (Z at the top thereof, and to retain said door at any desiredangle or its opening of suitable size there is hinged to the side of theash-pit, or to the side of the door-frame at 7:, a curved rack, K,havradial hollow ribs andaeollar projecting above IO ing its teeth 7cadapted to receive a latch-finsaid ribs, substantially as and for thepurpose ger, d, projecting from one edge of the door. described.

Having now fully described my invention, In testimony whereof I affix mysignature in 5 I claimpresence of two witnesses.

The combination of a base-plate, an outer MICHAEL lslAIIONY. shellhaving an inner annular rib at the bot- W'itnesses: tom, and a cast-ironinner shell consisting of a GEO. B. LAWRENCE,

continuous cylindrical body havinga series of XVM. P. CANTWELL, J r.

